Counting rr

Problem:-

Given a string consisting of lower-case letters . Count the total number of substring 'rr' present in the given string.No substring should be counted twice.
Input
Given a string s consisting of lower-case letters.
Output
Print the total number of substring 'rr' present in the given string.
Constraints
1 ≤ strlen(s) ≤ ${10}^5$

SAMPLE INPUT

 

rrrabc

SAMPLE OUTPUT

 

2

Explanation

"rr" substring is present two times in given string.

Time Limit:1.0 sec(s) for each input file.

Memory Limit:256 MB

Source Limit:1024 KB

solution:-

#include<stdio.h>

void main()

{

     char s[100000];

     int sum=0;

     scanf("%s",s);

     for(int i=0;s[i+1];i++)

     {

        if(s[i]=='r')

        {

            if(s[i+1]=='r')

             sum++;

        }

     }

     printf("%d",sum);

}